/Engine/Source/Runtime/CoreUObject/Public/UObject/Object.h
Given OtherObject (which will be the same type as 'this'), recursively find any matching sub-objects from 'this' that also exist within OtherObject, and add the mappings to ObjectMapping.
virtual void BuildSubobjectMapping ( [UObject](API\Runtime\CoreUObject\UObject\UObject) * OtherObject, [TMap](API\Runtime\Core\Containers\TMap)< [UObject](API\Runtime\CoreUObject\UObject\UObject) *, [UObject](API\Runtime\CoreUObject\UObject\UObject) * > & ObjectMapping ) const